ADMETELLA DOLICHOPUS. 07 



This species in its general structure much resembles A . longipedata Mcintosh, 

 secured by the Challenger from near Prince Edward Island (1,378 fms.). It is 

 like this species in having no notopodial setae, the long protruding .aciculum 

 being alone present; but the notopodial branch is more distinctly developed 

 and arises farther proximad, the acicula extend farther beyond the parapodial 

 lobes proper, and the ventral setae lack the characteristically bifid apex of those 

 of A. longipedata. Admetella renotubulata (Moore), described from a specimen 

 taken off Santa Catalina Island (2,196-2,228 fms.), is also evidently a closely 

 related species; but it is readily separated by the clearly different form of the 

 neuropodial setae, and the presence of notopodial setae, the latter not having 

 been detected in the other two species. All these species lack pigmented eyes, 

 though structures possibly representing modified eyes are noted in renotubulata. 



Admetella dolichopus, sp. nov.^ 

 Plate 10, fig. 1. 



There is nothing distinctive in the coloration of the preserved specimen, 

 the body appearing obscure yellow, the parapodia a soijiewhat Ughter yellow, 

 and the acicula nearly colorless. 



The body is fusiform, in general as in hastigerens, but the caudal region is 

 more strongly narrowed, becoming slender and subacutely pointed. The dor- 

 sum is convex; its integument presents a thinner, middorsal, longitudinal stripe 

 which is semitransparent. The venter is more depressed; it has a wide longi- 

 tudinal neural furrow in which lies a conspicuous neural ridge as in the preceding 

 species. Total length of the type 60 mm.; greatest width, exclusive of the 

 parapodia, about 5 mm.; to ends of extended parapodia, exclusive of acicular 

 processes, near 20 mm, ; to ends of acicula, near 24 mm. Total number of somites 

 in the type sixty or within one or two of that number; in the para type, fifty-seven. 



Prostomium about two thirds as long as wide, transversely oblong, the 

 anterior margin straight or nearly so between the widely separated ceratophores 

 of the lateral tentacles; on each side posteriorly a prominent lobe projects 

 laterad, neither this lobe or any other part of the prostomium showing any trace 

 of pigmentation. The ceratophore of the median tentacle is a very large body 

 inserted dorsally caudad of the middle of the prostomium; its diameter proxi- 

 mally is equal to half the greatest width of the prostomium as a whole; it 



^ SoXlxos, long, TToDs, foot. 



